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https://bugzilla.mozilla.org/show_bug.cgi?id=861938
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  <meta charset="utf-8">
  <title>Test for Bug 861938</title>
  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=861938">Mozilla Bug 861938</a>
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<pre id="test">
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  <script type="application/javascript">

  /** Test for Bug 861938 **/

  try {
    var canvas = document.createElement("canvas");
    canvas.getContext('2d').fill(undefined);

    ok(true, "Should be able to pass undefined to fill()");
  } catch(e) {
    ok(false, "Should be able to pass undefined to fill()");
  }
  </script>
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